Actor Yoo Ah-in, who has been largely absent from public view since receiving a suspended prison sentence for illegal drug use, has reignited speculation about a possible return to the entertainment industry after appearing at a VIP premiere in Seoul. Yoo attended the screening of director Na Hong-jin's upcoming film "Hope" on Monday at Megabox Coex in Seoul's Gangnam District, where numerous actors, singers and entertainment figures gathered. Videos and photos shared across online communities and social media showed Yoo dressed in black with a baseball cap pulled low over his face. Although he kept a low profile, he did not wear a face mask, drawing attention from attendees. Footage also captured the actor greeting acquaintances with a bright smile inside the theater. The appearance quickly fueled renewed speculation that Yoo may be preparing to resume acting. Rumors have resurfaced linking Yoo to director Jang Jae-hyun's upcoming film "Vampir," after reports said the two attended the screening together. Jang is best known for directing the hit occult thriller "Exhuma." Reports that Yoo